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OpenStudy (anonymous):
|k+9|=4 ? give answer for a medal and ill be a fan
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OpenStudy (anonymous):
-5
OpenStudy (anonymous):
-5+9=?
OpenStudy (ybarrap):
$$ |k+9|=4\\ (k+9)^2=4^2=16\\ k^2+18k+81=16\\ k^2+18k+81-16=0\\ k^2+18k+65\\ (k+5) (k+13) = 0 $$ So k=-5 and k=-13. Make sense?
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